U Unknown New member Dec 15, 2010 #1 i was considering getting the jump manual because my vertical is really low its like 11 inches. i play basketball. i weigh 135 pounds and 5'9 i really want to jump higher and want to know if this jump manual actually makes a difference.
i was considering getting the jump manual because my vertical is really low its like 11 inches. i play basketball. i weigh 135 pounds and 5'9 i really want to jump higher and want to know if this jump manual actually makes a difference.
